package com.lkj.nio.groupchat;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Scanner;

/**
 * @author likanjia
 */
public class GroupChatClient {

    private final String HOST = "127.0.0.1";

    private final int PORT = 6667;

    private Selector selector;

    private SocketChannel socketChannel;

    private String username;

    public GroupChatClient() throws Exception {

        selector = Selector.open();

        socketChannel = SocketChannel.open(new InetSocketAddress(HOST, PORT));

        socketChannel.configureBlocking(false);

        socketChannel.register(selector, SelectionKey.OP_READ);

        username = socketChannel.getLocalAddress().toString().substring(1);

        System.out.println(username +" is ok...");

    }

    public void sendInfo(String info){
        info = username +" 说："+info;

        try {
            socketChannel.write(ByteBuffer.wrap(info.getBytes()));

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void readInfo() {
        try {
            int readCount = selector.select();

            if (readCount > 0) {
                Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
                while (iterator.hasNext()) {
                    SelectionKey key = iterator.next();

                    if (key.isReadable()) {
                        SocketChannel sc = (SocketChannel) key.channel();

                        ByteBuffer buffer = ByteBuffer.allocate(1024);

                        sc.read(buffer);

                        String msg = new String(buffer.array());

                        System.out.println(msg.trim());
                    }
                }
                iterator.remove();
            } else {
                System.out.println("空...");
            }

        } catch (Exception ex) {

        }
    }

    public static void main(String[] args) throws Exception {

        GroupChatClient client = new GroupChatClient();

        new Thread() {
            @Override
            public void run() {

                while (true) {
                    client.readInfo();

                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

            }
        }.start();

        Scanner scanner = new Scanner(System.in);

        while (scanner.hasNextLine()) {
            String s = scanner.nextLine();
            client.sendInfo(s);
        }
    }
}
